Используйте приложение APKPure
Историческую версию JSC Math Solution (Offline) можно получить на Android
ОАО математическое решение. জেএসসি গণিত সমাধান
In this App you will find math solutions of class 8. You will be able to walk through the every chapters. You can download this app from anywhere and read it from anywhere.
When you read this app you do not need any internet or WiFi connection.